Hack Photoshop CS3 Trial (MAC)

Go to Applications/Adobe Photoshop CS3/Adobe PhotoshopCS3 (the application file itself).Right click on the app,and choose “Show package contents”
In the new window, go to Contents//Resources/AMT/,and change the name of “application.sif”, just the same way as on Windows.
This has just worked for me on an Intel Core Duo MacBook running 10.4.8, on a CS3 trial downloaded from Adobe earlier today.
p/s if after a few day, and still ask the key, just quit then go to the step as i told b4, then rename "application.sif" to "aplication.sif_"
adobe already fix this trick!@#.. but dont worry, try search the previous trial in some hackers website.
Good luck!